The Utah Highway Patrol, (801) 596-9248, enforces the tarp law. This law basically states that a vehicle carrying dirt, sand, gravel, rock fragments, pebbles, crushed base, aggregate, any other similar materials or scrap metal shall have a covering over the entire load unless:

The highest point of the load does not extend above the top of any exterior wall or sideboard of the cargo compartment of the vehicle.

The outer edges of the load are at least six inches below the top inside edges of the exterior walls or sideboards of the cargo compartment of the vehicle.